609681499 has 4 divisors (see below), whose sum is σ = 696778864. Its totient is φ = 522584136.

The previous prime is 609681491. The next prime is 609681503. The reversal of 609681499 is 994186906.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 609681499 - 2³ = 609681491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609681491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43548672 + ... + 43548685.

It is an arithmetic number, because the mean of its divisors is an integer number (174194716).

Almost surely, 2^609681499 is an apocalyptic number.

609681499 is a deficient number, since it is larger than the sum of its proper divisors (87097365).

609681499 is an equidigital number, since it uses as much as digits as its factorization.

609681499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87097364.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 609681499 is about 24691.7293643033. The cubic root of 609681499 is about 847.9449774990.

The spelling of 609681499 in words is "six hundred nine million, six hundred eighty-one thousand, four hundred ninety-nine".